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Drupady [299]
3 years ago
7

Your friend says that the heavyweight champion of the world cannot exert a force of N on a piece of tissue paper with his best p

unch. The tissue paper is held in midair, no wall and no tricks.a. You agree that it can't be done.b. You disagree, for a good punch easily delivers this much force.c. You have reservations about this claim.
Physics
1 answer:
worty [1.4K]3 years ago
4 0

Answer:

You agree that it can't be done.

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A train is traveling away from you at 120 km/h. it blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound
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Answer:B)439.21 Hz

Explanation:

Given

velocity of train v=120 km/h\approx 120\times \frac{5}{18}=33.33 m/s

frequency of train f_a=0.400 kHz\approx 400 Hz

speed of sound c=340 m/s

frequency from Doppler effect can be calculated by

f_a=(\frac{c}{c+v})\cdot f

400=(\frac{340}{340+33.33})\cdot f

400=\frac{340}{373.33}\cdot f

f=400\times 1.098

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